what to put between switch() statement C code example

Example 1: switch statement in c

#include <stdio.h>

int main(void)
{
  	int a = 0;
  
    switch(a)
    {
       case 1 :
          statement("a = 1");
          break;

       case 2 :
          printf("a = 2");
          break;

       default :
       	  printf("a is neither 1 or 2");
	      break;
    }
}

Example 2: Switch Mode C Programming

//A switch statement allows a variable to be 
//tested for equality against a list of values.

#include <stdio.h>

int mode = 2; 

int main() {
  //switch takes argument and gives cases for it. 
    switch (mode) {
        //each case has a value for which it tests... 
        case 1: 
            //Your code goes here... 
            
            printf("This is mode #1.\n"); 
        //each case must have break otherwise code will fall 
        //through into next case. This is good for some things 
        //like testing multiple case at once on the same value, though. 
        break; 
        case 2: 
            //Your code goes here... 
            
            printf("This is mode #2\n"); 
        break; 
        case 3: 
            //Your code goes here... 
            
            printf("This is mode #3.\n"); 
        break; 
    }
	return 0;
}